Geometric design instrument



p 23, 1969 D. v. SMITH 3,468,032

GEOMETRIC nnsmu INSTRUMENT Filed May 24, 1968 HHHHH III ----,l;-----I I II ATTORNEY.

Unite States Patent ice 3,468,032 GEOMETRIC DESIGN INSTRUMENT Dan Vernon Smith, 210-03 43rd St., Bayside, N.Y. 11361 Filed May 24, 1968, Ser. No. 731,839 Int. Cl. B431 11/04 US. Cl. 3327 1 Claim ABSTRACT OF THE DISCLOSURE The device has, first, the provision of a novel marker holder longitudinally adjustable in a novel form of carrier therefor, the provision of arcuately arranged holes directly in the base member which thus eliminate the fence of pegs, and the provision of special shouldered stud-shafts integral with the gears and having bearings both on the top of the base member and laterally against annular depending surfaces of the base member integrally therewith.

The instrument is an improvement over the structure disclosed in my Patent No. 3,298,104.

The invention will be described with reference to the accompanying drawings, in which:

FIG. 1 is a top plan view of an embodiment, showing in dotted lines one adjustment of the carrier for the marker holder.

FIG. 2 is a side elevation of said embodiment.

FIG. 3 is a front end elevation of the embodiment.

FIG. 4 is a fragmentary and enlarged section on the line 44, FIG. 1.

FIG. 5 is a fragmentary and enlarged section on the line 5 of FIG. 1.

FIG. 6 is an enlarged section showing the marker holder, being taken on the line 66, FIG. 1.

FIG. 7 is a detail perspective view of the pivot stud which receives the carrier for the marker holder, and which in turn is received in one of the arcuately arranged holes formed directly in then base member.

FIG. 8 is a composite view showing three of the many designs which may be formed by the device.

Referring to the drawings it will be seen that the device comprises a base member 1, which may be formed of sheet metal if desired and which at its rear end is formed with a group of arcuately arranged holes indicated at 2. Any of these holes may receive a pivot stud 3 as illustrated in FIG. 7, and the stud has at one end a pintle 3 below a ribbed finger-grip area, the top of the pivot stud having a rounded projection to receive the carrier for the marker holder. This carrier forms an important element of the invention in combination with the marker holder, and the latter may be adjusted longitudinally thereon and frictionally held in any adjusted position without the use of a clamping screw or other applied means. The carrier consists of a length of wire rod bent to form two side by side legs, one of the legs preferably being longer than the other and having a short bend at one end to selectively enter the radially arranged holes in a minor-driven gear 5. The longer leg of the carrier is shown at 6 and the minor or shorter leg at 7.

It is preferred that the marker holder 8, FIG. 6, be of cast metal or allied material having relative weight. It is shown in FIG. 6, and at its bottom face it is formed with two channels to grippingly receive the legs of the carrier 3,468,032 Patented Sept. 23, 1969 and yet to permit the latter to give sliding connection. It is of course apparent that the carrier legs will customanly be of greater spacing than the channels in the marker holder. The wire-rod carrier being springy will permit the legs to be moved into the channels of the marker holder and to have frictional action on the walls thereof. In FIG. 6 the channels are indicated at 8 and with the carrier legs therein.

The marker holder is formed with a neck 8 to receive a pen or pencil in its aperture as shown in FIG. 6, and the wall of the aperture is shown holding a spring element 10 for releasably gripping such marking implement.

At 4, FIG. 1, is shown the base member 1 supporting a major driven gear 4, the latter having a broad face with an inset central area for holding a sheet to receive the marking. It will be seen that the marker holder may be adjusted on its carrier and relatively to the sheet. A driving gear 11, having a handle 12, is in mesh with major gear 4 and the latter is in mesh with minor driven gear 5.

Referring to FIGURES 4 and 5 it will be seen that the gears are hollow in that the teeth are formed as hollow elements flanged at their sides and front, and that, as best shown in FIG. 4, each gear has an axial depending stud-shaft with an intermediate annular shoulder which bears upon the top surface of the base member and with the shaft extension bearing laterally on a downturned annular flange depending from the base member and as indicated at 13. A spring clip of the stud shaft extension, may, in each case, abut the bottom edge of the flange 13, as shown at 14.

The form of the carrier and the marker holder enables immediate nice adjustment of the marker longitudinally of the carrier with automatic frictional holding of the marker holder in the adjusted position, and the placement of the pivot stud 3 is made easy and simple for a child operator in additional desired changes in the design to be formed; and the mounting of the gears is simplified with the double bearing arrangement which prevents rocking and provides improved larger gear surfaces with lightness in weight. Furthermore the form of marker holder enables improved holding of the marker with weight confined to the point it is needed, i.e. the point of marker inscription.

Having described my invention, What I claim and desire to secure by Letters Patent is as follows:

1. A geometric design instrument, comprising a base member having at its top spaced arcuately arranged holes and inwardly of its margin three bearing apertures, each bearing aperture being surrounded by a depending annular flange integral with the base member, a primary gear having an upper surface adapted to receive a sheet to be marked and integrally carrying a depending hub received in one of said bearing apertures, a driving gear with a depending hub received in one of said bearing apertures and in mesh with the primary gear, and a driven gear having a hub received in one of said bearing apertures and in mesh with the primary gear, said driven gear being formed at its top with a plurality of rows of holes radially thereof, a peg selectively received in one of said arcuately arranged holes of the base member, a marker holder consisting of a wire bent at one end as a loop forming a long leg and a shorter leg, both legs facing the primary gear in the face plane of the latter, the outer end of the loop thereof receiving said peg,

3 4 and a carrier for a marking instrument formed with a References Cited relatively flat base face and an upstanding annular pro- UNITED STATES PATENTS jection, said projection being formed with a vertically 1,184,529 5/1916 Huey extending aperture through the same and through the base 1,254,003 1/1918 Stainkamp' of the carrier, said aperture being adapted to receive and 5 1,307,958 6/1919 Ch frictionally hold a marking instrument exemplified by 9. 3,298,104 1/1967 Smith. pen, said carrier being formed in its base with two in-cut FOREIGN PATENTS channels adapted to frictionally engage and hold the legs 1,457,978 9/1966 France.

of the marker holder and thereby enable movement of 10 the latter manually for adjustment. HARRY N. HAROIAN, Primary Examiner 

